I like the XPort from Lantronix, but is ehernet, I'm not sure if it will
be ok for your application.
Best regards
		Luis


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of hgraf
Sent: 23 October 2007 16:28
To: Microcontroller discussion list - Public.
Subject: [EE]: Moderate speed easy connection to PC?

Hello everyone,

I currently have a project where I connect an FPGA to a PC over a USB
port to transfer data. I've been using one of the FTDI chips (the
FT245). The chip works wonderfully, and the fact that it enumerates as a
serial port has made the project very successful (mostly since the
software side has remained uncomplicated).

However, being a Full Speed USB device the max speed I've been able to
transfer from the FPGA to the PC is about ~5-600kBps. 

This speed has been fine up till now. There has been a "redefinition" of
requirements :) and they want to be able to transfer faster.

Ideally I'd like a solution that supports about 2-4MBps, clearly out of
the range of Full Speed USB.

I was wondering if anyone here could suggest a solution they've had
success with? It doesn't appear that FTDI makes chips that support
Hi-Speed USB (which would easily give me the speed I want). Anybody know
of a similarly simple (on the software side) chip that does HS USB2.0? I
don't really care what chip it is, and cost is not a factor (since this
is an R&D type project and volumes are low), all I really care about is
ease of use.

I know of the Cypress parts that can easily do USB2.0 speeds, what's the
software interface though? I'd assume it's more complicated then a
virtual serial port, how much more complicated? It MUST support Linux,
so that probably limits my options.

I would prefer sticking with USB, however if anyone has other
suggestions I'd be interested in hearing them. The solution must be
simple, standard (i.e. no custom wiring on the PC side) and I would
prefer low pin count.

Thanks for your suggestions! TTYL

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